Heat exchanger for waste heat recovery from ultra-high temperature liquid metallurgical slag

Abstract

The present invention relates to a heat exchanger for waste heat recovery of ultra-high temperature liquid metallurgical slag, comprising a heat exchange tube group; a heat exchange plate group is arranged outside the heat exchange tube group; the heat exchange plate group arranged outside the heat exchange tube group forms a heat exchange cavity; the heat exchange cavity is filled with a heat transfer metal; the heat transfer metal is connected to the heat exchange plate group and the heat exchange tube group as a whole. The present invention can be used for heat recovery of ultra-high temperature liquid metallurgical slag, effectively solving the problem that traditional heat exchangers cannot directly recover waste heat from ultra-high temperature liquid metallurgical slag.

Description

Technical Field

[0001] The invention relates to a heat exchanger for recovering waste heat, in particular to a heat exchanger for recovering waste heat from ultra-high temperature liquid metallurgical slag. Background Art

[0002] In the metallurgical industry, metallurgical slag produced during metallurgy is often processed. In order to improve the utilization of metallurgical slag, the waste heat of metallurgical slag is often recovered. The metallurgical slag used for waste heat recovery is obtained by cooling and solidifying ultra-high temperature liquid metallurgical slag and then manufacturing high-temperature solid particles through a granulator.

[0003] The reason why it needs to be cooled and solidified first is that the temperature of ultra-high temperature liquid metallurgical slag is very high and its composition is complex. If it is directly used for heat exchange, the temperature change span is large, and the impact frequency of the heat exchange system for heat exchange is too large, and the equipment is easily damaged. Therefore, there is currently no heat exchanger that can directly use ultra-high temperature metallurgical slag for heat exchange. Summary of the invention

[0004] The purpose of the present invention is to provide a heat exchanger for recovering waste heat from ultra-high temperature liquid metallurgical slag, which can be used for heat recovery from ultra-high temperature liquid metallurgical slag and will not be melted or corroded by the ultra-high temperature liquid metallurgical slag during recycling.

[0005] The technical solution for achieving the purpose of the present invention is as follows: the present invention comprises a heat exchange tube group; a heat exchange plate group is arranged outside the heat exchange tube group; the heat exchange plate group arranged outside the heat exchange tube group forms a heat exchange cavity; the heat exchange cavity is filled with a heat transfer metal; the heat transfer metal is connected to the heat exchange plate group and the heat exchange tube group as a whole.

[0006] The heat transfer metal is lower than the upper opening of the heat exchange cavity; the heat exchange cavity is filled with a low melting point alloy between the upper opening and the heat transfer metal.

[0007] The outer surface of the heat exchange plate group is coated with a heat insulation coating.

[0008] As an optimized design, the heat exchange plate group includes a front side plate, a rear side plate, a left side plate, a right side plate and a lower side plate; the front side plate, the rear side plate, the left side plate, the right side plate and the lower side plate are arranged around the outside of the heat exchange tube group; the heat exchange tube group is in contact with the heat exchange plate group and is fixedly connected as a whole.

[0009] The above-mentioned heat exchange tube group includes a plurality of front heat exchange tubes which are parallel to each other and arranged linearly, a plurality of rear heat exchange tubes which are parallel to each other and arranged linearly, a plurality of upper bent tubes and a plurality of lower bent tubes; the upper end of the front heat exchange tube is connected to the upper end of the rear heat exchange tube through the upper bent tube, and the lower end of the front heat exchange tube is connected to the lower end of the rear heat exchange tube through the lower bent tube, thereby forming a heat exchange tube group with an inlet and an outlet.

[0010] The above-mentioned front side plate includes multiple first connecting plates; the rear side plate includes multiple second connecting plates; the lower side plate includes multiple third connecting plates; the left and right sides of the first connecting plate are respectively connected to the two adjacent front heat exchange tubes by welding; the left and right sides of the second connecting plate are respectively connected to the two adjacent rear heat exchange tubes by welding; the left and right sides of the third connecting plate are respectively connected to the two adjacent lower bent tubes by welding; the front and rear sides of the upper end of the third connecting plate are respectively connected to the lower end of the first connecting plate and the lower end of the second connecting plate; the left side plate is connected to the leftmost front heat exchange tube, the rear heat exchange tube and the lower bent tube by welding; the right side plate is connected to the rightmost front heat exchange tube, the rear heat exchange tube and the lower bent tube by welding.

[0011] The outer surface of the heat exchange plate group and the surface of the heat exchange tube group outside the heat exchange cavity are coated with a heat insulation coating.

[0012] At least one mounting bracket for fixed installation is fixedly provided on the upper end of the heat exchange plate group, preferably two.

[0013] The mounting bracket includes a plurality of first fixing plates located between the upper bent pipes and fixedly connected to the front side plate and the rear side plate; each first fixing plate is fixedly connected to a second fixing plate, and a fixing body that can be fixedly mounted is provided on the second fixing plate.

[0014] The present invention has positive effects: (1) The present invention uses heat transfer metal to form a heat exchange plate group and a heat exchange tube group into a whole. Since the ultra-high temperature liquid metallurgical slag may not be able to fully contact the heat exchange plate group when flowing, it will cause the problem of uneven heating. Under the heat conduction effect of the heat transfer metal, the heat energy can be effectively conducted, thereby realizing efficient heat absorption.

[0015] (2) Since the ultra-high temperature liquid metallurgical slag will cause a certain impact on the heat exchange plate group when flowing, the local pressure is large, and because the expansion coefficients of different materials are different, the heat transfer metal and the heat exchange plate group and the heat exchange tube group will often be separated during use, thereby causing gaps and affecting heat conduction and absorption. Therefore, the present invention uses the property of low melting point alloy (which will melt at a temperature higher than 180°C) to melt at high temperature, and it will automatically fill the gaps between the heat transfer metal and the heat exchange plate group and the heat exchange tube group, thereby ensuring heat conduction and heat absorption.

[0016] (3) The present invention utilizes a thermal insulation coating to effectively prevent ultra-high temperature liquid metallurgical slag from burning through it; and can reduce the adsorption of ultra-high temperature metallurgical slag on the surface of the heat exchange plate group, thereby ensuring the heat recovery efficiency; and at the same time can reduce the softness of the part coated with the thermal insulation coating.

[0017] (4) The present invention can also play a good anti-corrosion role under the action of the thermal insulation coating, effectively improving the service life and use effect of the equipment.

[0018] (5) The heat exchange plate group and the heat exchange tube group of the present invention are integrated, and the heat exchange tube group is directly involved in heat exchange, which can further improve the heat energy absorption efficiency.

[0019] (6) The present invention applies a thermal insulation coating on the outside of the heat exchange cavity in order to obtain the benefits of the thermal insulation coating.

[0020] (7) The present invention can be fixedly connected to the heat exchange equipment through the mounting bracket.

[0021] (8) The present invention can enhance the impact resistance by using two mounting brackets. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a longitudinal cross-sectional view of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the heat exchange plate group and the thermal insulation coating in the present invention;

[0026] Figure 4 It is a structural schematic diagram of the heat exchange tube group in the present invention;

[0027] Figure 5 is a transverse cross-sectional view of embodiment 1 of the present invention;

[0028] Figure 6 Schematic diagram of the structure of the heat exchange plate group and the heat exchange tube group in Example 2 of the present invention. DETAILED DESCRIPTION

[0029] (Example 1)

[0030] See Figures 1 to 5 The present invention comprises a heat exchange tube group 1; a heat exchange plate group 2 is arranged outside the heat exchange tube group 1; the heat exchange plate group 2 arranged outside the heat exchange tube group 1 forms a heat exchange cavity; the heat exchange cavity is filled with a heat transfer metal 3; the heat transfer metal 3 is connected to the heat exchange plate group 2 and the heat exchange tube group 1 as a whole.

[0031] The heat transfer metal 3 is lower than the upper opening of the heat exchange cavity; the heat exchange cavity is filled with a low melting point alloy 4 between the upper opening and the heat transfer metal 3 .

[0032] The outer surface of the heat exchange plate group 2 is coated with a heat insulation coating 5. The material of the heat insulation coating 5 is a ceramic heat insulation coating.

[0033] The heat exchange plate group 2 includes a front side plate 21, a rear side plate 22, a left side plate 23, a right side plate 24 and a lower side plate 25; the front side plate 21, the rear side plate 22, the left side plate 23, the right side plate 24 and the lower side plate 25 are arranged outside the heat exchange tube group 1; the heat exchange tube group 1 is in contact with the heat exchange plate group 2 and is fixedly connected to form a whole.

[0034] Two mounting brackets 6 for fixed installation are fixedly provided at the upper end of the heat exchange plate group 2; the mounting bracket 6 includes a plurality of first fixing plates 61 located between the upper bent pipes 13 and fixedly connected to the front side plate 21 and the rear side plate 22; each first fixing plate 61 is fixedly connected to the second fixing plate 62, and a mounting body 63 that can be fixedly installed is provided on the second fixing plate 62.

[0035] (Example 2)

[0036] See Figures 1 to 4 ,as well as Figure 6 The present invention comprises a heat exchange tube group 1; a heat exchange plate group 2 is arranged outside the heat exchange tube group 1; the heat exchange plate group 2 arranged outside the heat exchange tube group 1 forms a heat exchange cavity; the heat exchange cavity is filled with a heat transfer metal 3; the heat transfer metal 3 is connected to the heat exchange plate group 2 and the heat exchange tube group 1 as a whole.

[0037] The heat transfer metal 3 is lower than the upper opening of the heat exchange cavity; the heat exchange cavity is filled with a low melting point alloy 4 between the upper opening and the heat transfer metal 3 .

[0038] The heat exchange plate group 2 includes a front plate 21, a rear plate 22, a left plate 23, a right plate 24 and a lower plate 25; the front plate 21, the rear plate 22, the left plate 23, the right plate 24 and the lower plate 25 are arranged outside the heat exchange tube group 1.

[0039] The heat exchange tube group 1 includes a plurality of front heat exchange tubes 11 which are parallel to each other and arranged linearly, a plurality of rear heat exchange tubes 12 which are parallel to each other and arranged linearly, a plurality of upper bends 13 and a plurality of lower bends 14; the upper ends of the front heat exchange tubes 11 and the upper ends of the rear heat exchange tubes 12 are connected and communicated through the upper bends 13, and the lower ends of the front heat exchange tubes 11 and the lower ends of the rear heat exchange tubes 12 are connected and communicated through the lower bends 14, thereby forming a heat exchange tube group 1 with an inlet and an outlet.

[0040] The front side plate 21 includes a plurality of first connecting plates 211; the rear side plate includes a plurality of second connecting plates 221; the lower side plate 25 includes a plurality of third connecting plates; the left and right sides of the first connecting plate 211 are respectively connected to the two adjacent front heat exchange tubes 11 by welding; the left and right sides of the second connecting plate 221 are respectively connected to the two adjacent rear heat exchange tubes 12 by welding; the left and right sides of the third connecting plate are respectively connected to the two adjacent lower bent tubes 14 by welding; the front and rear sides of the upper end of the third connecting plate are respectively connected to the lower end of the first connecting plate 211 and the lower end of the second connecting plate 221; the left side plate 23 is connected to the leftmost front heat exchange tube 11, the rear heat exchange tube 12 and the lower bent tube 14 by welding; the right side plate 24 is connected to the rightmost front heat exchange tube 11, the rear heat exchange tube 12 and the lower bent tube 14 by welding.

[0041] The outer surface of the heat exchange plate group 2 and the surface of the heat exchange tube group 1 outside the heat exchange cavity are coated with a heat insulation coating 5. The material of the heat insulation coating 5 is a ceramic heat insulation coating.

[0042] Two mounting brackets 6 for fixed installation are fixedly provided at the upper end of the heat exchange plate group 2; the mounting bracket 6 includes a plurality of first fixing plates 61 located between the upper bent pipes 13 and fixedly connected to the front side plate 21 and the rear side plate 22; each first fixing plate 61 is fixedly connected to the second fixing plate 62, and a mounting body 63 that can be fixedly installed is provided on the second fixing plate 62.

[0043] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Heat exchanger for waste heat recovery of ultra-high temperature liquid metallurgical slag, characterized by: A heat exchange tube group (1) is provided; a heat exchange plate group (2) is arranged outside the heat exchange tube group (1); the heat exchange plate group (2) arranged outside the heat exchange tube group (1) forms a heat exchange cavity; the heat exchange cavity is filled with a heat transfer metal (3); the heat transfer metal (3) is connected to the heat exchange plate group (2) and the heat exchange tube group (1) as a whole; The heat transfer metal (3) is lower than the upper opening of the heat exchange cavity; the heat exchange cavity is filled with a low melting point alloy (4) between the upper opening and the heat transfer metal (3); The outer surface of the heat exchange plate group (2) is coated with a heat insulation coating (5); The heat exchange plate group (2) comprises a front side plate (21), a rear side plate (22), a left side plate (23), a right side plate (24) and a lower side plate (25); the front side plate (21), the rear side plate (22), the left side plate (23), the right side plate (24) and the lower side plate (25) are arranged outside the heat exchange tube group (1); the heat exchange tube group (1) is in contact with the heat exchange plate group (2) and is fixedly connected to form a whole; The heat exchange tube group (1) comprises a plurality of front heat exchange tubes (11) which are arranged in parallel and linearly, a plurality of rear heat exchange tubes (12) which are arranged in parallel and linearly, a plurality of upper bent tubes (13) and a plurality of lower bent tubes (14); the upper ends of the front heat exchange tubes (11) and the upper ends of the rear heat exchange tubes (12) are connected and communicated with each other through the upper bent tubes (13), and the lower ends of the front heat exchange tubes (11) and the lower ends of the rear heat exchange tubes (12) are connected and communicated with each other through the lower bent tubes (14), thereby forming a heat exchange tube group (1) having an inlet and an outlet.

2. The heat exchanger for recovering waste heat from ultra-high temperature liquid metallurgical slag according to claim 1, characterized in that: The front side plate (21) comprises a plurality of first connecting plates (211); the rear side plate comprises a plurality of second connecting plates (221); the lower side plate (25) comprises a plurality of third connecting plates; the left and right sides of the first connecting plate (211) are respectively connected to two adjacent front heat exchange tubes (11) by welding; the left and right sides of the second connecting plate (221) are respectively connected to two adjacent rear heat exchange tubes (12) by welding; the left and right sides of the third connecting plate are respectively connected to two adjacent lower heat exchange tubes (12) by welding; The bent pipes (14) are connected as a whole by welding; the front and rear sides of the upper end of the third connecting plate are respectively connected to the lower end of the first connecting plate (211) and the lower end of the second connecting plate (221) to form a whole; the left side plate (23) is connected to the leftmost front heat exchange tube (11), the rear heat exchange tube (12) and the lower bent pipe (14) by welding; and the right side plate (24) is connected to the rightmost front heat exchange tube (11), the rear heat exchange tube (12) and the lower bent pipe (14) by welding.

3. The heat exchanger for recovering waste heat from ultra-high temperature liquid metallurgical slag according to claim 2, characterized in that: The outer surface of the heat exchange plate group (2) and the surface of the heat exchange tube group (1) located outside the heat exchange cavity are both coated with a heat insulation coating (5).

4. The heat exchanger for recovering waste heat from ultra-high temperature liquid metallurgical slag according to claim 3, characterized in that: At least one mounting bracket (6) for fixed mounting is fixedly provided on the upper end of the heat exchange plate group (2).

5. The heat exchanger for recovering waste heat from ultra-high temperature liquid metallurgical slag according to claim 4, characterized in that: The mounting bracket (6) comprises a plurality of first fixing plates (61) located between the upper curved pipes (13) and fixedly connected to the front side plate (21) and the rear side plate (22); each first fixing plate (61) is fixedly connected to a second fixing plate (62), and a mounting body (63) that can be fixedly mounted is provided on the second fixing plate (62).

6. The heat exchanger for recovering waste heat from ultra-high temperature liquid metallurgical slag according to claim 5, characterized in that: There are two mounting brackets (6).

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